Kremez, M.I., Povod, M.H., Zhelizniak, I.M., Shostia, H.M., Shpyrna, I.H. and Karunna, T.I. 2024. PRODUCTIVE QUALITIES OF SOWS OF THE GREAT WHITE AND LANDRACE BREEDS OF ENGLISH ORIGIN DURING PUREBRED BREEDING AND CROSSING AND THE APPEARANCE OF VARIOUS FORMS OF HETEROSIS WHEN COMBINING THESE BREEDS. Bulletin of Sumy National Agrarian University. The series: Livestock. 3 (Oct. 2024), 39-50. DOI:https://doi.org/10.32782/bsnau.lvst.2024.3.5.